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Forum topic by luthierwnc posted 02-27-2016 03:01 PM 457 views 0 times favorited 11 replies Add to Favorites Watch
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luthierwnc

115 posts in 1241 days


02-27-2016 03:01 PM

Hi All,

I replaced the motor in my drill press and was hoping to use the old motor for a lower-speed buffer/wire wheel. The bearings were noisy so I pulled them and ordered a set of 5/8” ID replacements. Alas, the shaft actually measures 0.6285 and even with some not-so-gentle persuasion it was a no-go. It’s a small increment but enough to pooch the fit.

The motor is original to a 1957 Rockwell press and I haven’t been able to find bearings that are slightly oversized to fit. I’m also nearing the point of it not being worth the cost or effort to keep the motor in service (i.e. turning the rotor)

If you have any cheap and easy fixes, I hope you’ll post them. Thanks, sh


11 replies so far

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MrUnix

4230 posts in 1663 days


#1 posted 02-27-2016 04:30 PM

First off… did you get the numbers off the old bearings and/or measure them (bore, OD and width of both inner and outer race)? Second – you seem to be measuring in inches, while those bearings are almost certainly metric. You might also want to check the replacement bearing list over at the Vintagemachinery site.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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runswithscissors

2189 posts in 1490 days


#2 posted 02-27-2016 09:52 PM

Those bearings may require a press for installing. Pounding them on isn’t good for shaft or bearing.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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tomsteve

394 posts in 684 days


#3 posted 02-27-2016 11:14 PM

put the bearings under a lamp for about an hour to heat em up and expand the inner race and put the shaft(whole motor if necessary) in the freezer for about an hour to shrink the metal and try to install em.

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luthierwnc

115 posts in 1241 days


#4 posted 02-28-2016 02:39 AM

These are the bearings for the original motor so the Delta cross-reference didn’t help much. I did heat the bearings in the oven and froze the rotor. The main part of this project was replacing the pulley bearings using a homebrewed press made from wood scraps and a bottle jack. They slid on pretty easily. I’ll adapt that jig for this application and try again. Cheers, sh

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Ger21

1047 posts in 2596 days


#5 posted 02-28-2016 02:42 AM

Are you sure it’s not a 16mm shaft?

-- Gerry, http://www.thecncwoodworker.com/index.html http://www.jointcam.com

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MrUnix

4230 posts in 1663 days


#6 posted 02-28-2016 02:45 AM

Your shaft measurement is roughly that of 16mm, so trying to press a bearing with a 5/8” bore isn’t going to work and possibly do damage. Again, did you get the numbers off the old bearings and/or measure them? More than likely, you are looking at some 87xxx or 88xxx felt sealed bearings that have a 16mm bore.

Cheers,
Brad

PS: What is the motor model #? I’ve never seen a Delta motor that used imperial sized bearings.

-- Brad in FL - To be old and wise, you must first be young and stupid

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luthierwnc

115 posts in 1241 days


#7 posted 02-28-2016 03:44 PM

Thanks MrUnix,

I went by measurement and was off enough to buy the wrong parts. The original is a Hoover #87016 which specs a 16mm ID. They are still readily available. I wish the Ebay selection would show more than the box because the inner race and shield on these is slightly thicker than the outer race. I don’t think it will matter here but once-burned … I’ve attached a picture of the original (which sounds like an old roller skate) and the wrong-sized replacement.

I’ll get a pair, re-jig the bearing press and have another try. Cheers, sh

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MrUnix

4230 posts in 1663 days


#8 posted 02-28-2016 04:51 PM

The original is a Hoover #87016 which specs a 16mm ID. They are still readily available. I wish the Ebay selection would show more than the box because the inner race and shield on these is slightly thicker than the outer race. I don’t think it will matter here…
- luthierwnc

Yup, those old Hoover bearings were considered ‘sealed’, but used a felt seal under the metal shield instead of the more modern rubber seals. They have an extended inner race, which does matter – you need to make sure you orient them the proper direction when installing. The extended race should face inwards. I would also recommend not sourcing them from e-bay, but instead from a reputable bearing supplier such as Accurate.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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luthierwnc

115 posts in 1241 days


#9 posted 02-28-2016 08:35 PM

Thanks Brad,

I already dialed up two on Ebay. They are actual NOS Hoover units. I’ll keep the Accurate link handy, though. This motor also has felt washers held in place by a thin metal washer at the far end of each bell end. They are in good shape but I haven’t oiled them in the 25 years or so I’ve owned the press.

I wouldn’t have gotten this far but I already have two extensions that are female 1/2” with set screws and male 1/2” threads for holding stones, buffers and wire-wheels. There’s a Cratex wheel in the bin somewhere too.

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MrUnix

4230 posts in 1663 days


#10 posted 02-28-2016 09:11 PM

I already dialed up two on Ebay. They are actual NOS Hoover units.

Good deal… but I do hope those bearings are still good – they do have a shelf life and due to the shield, they are almost impossible to re-grease. Worst case is you will be opening that motor up again sooner than later to replace them with some fresh ones.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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luthierwnc

115 posts in 1241 days


#11 posted 02-28-2016 11:16 PM

If I get a hundred hours in the next 20 years, I’m good. Of course, it still has to fire up the first time. All of the electrical connections look solid. The capacitor was working fine but I’ll check it for leaks before reassembly. sh

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